Identifying Non-Element Substances
This question requires identifying which of the given options is a compound, not a pure chemical element.
Analyzing the Options
- Silicon: This is a chemical element with the symbol Si.
- Germanium: This is a chemical element with the symbol Ge.
- Graphite: This is an allotrope (a specific form) of the element Carbon (C).
- Silica: This is commonly known as Silicon Dioxide, with the chemical formula $SiO_2$.
Conclusion: Element vs. Compound
Silica ($SiO_2$) consists of atoms of both Silicon and Oxygen bonded together. It is therefore a compound.
Silicon, Germanium, and Carbon (represented by graphite) are all elements.
Answer Derivation: Since Silica is a compound ($SiO_2$) and not a pure element, it is the correct answer.
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Important Questions from Basic Concepts of Chemistry
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Which one of the following methods can be used to separate anthracene from a mixture of salt and anthracene ?
Which among the following are essential constituents of Portland cement?
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Combination of one volume of nitrogen with three volumes of hydrogen produces
